Hydraulic chair.



No. 675,009. Patented Mayv 28, I901. F. KOENIGKRAMER.

HYDRAULIC CHAIR.

(Application filed Feb. 25, 1901.) (-No Model.) 2 Sheets-Sheet I.

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No. 675,009. Patented May 28, l90l. F. KOENIGKBAMER.

HYDRAULIC CHAIR.

(Application filed Feb. 25, 1901.) (No Model.) 2 Sheets-Shaet 2.

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UNTTED STATES PATENT nrrcE.

FRANK KOENIGKRAMER, OF CINCINNATI, OHIO, ASSIGNOR OF ONE-HALF TOFREDERICK KOENIGKRAMER, OF SAME PLACE.

HYDRAULIC CHAIR.

SPECIFICATION forming part of Letters Patent No. 675,009, dated May 28,1901.

Application filed February 25, 1901. berial No- 48,7'71. (N0 model.)

To aZZ whmn it ntay concern.-

Be it known that I, FRANK KOENIGKRAMER, a citizen of the United States,residing at Cincinnati, in the county of Hamilton and State of Ohio,have invented certain new and useful Improvements in Hydraulic Chairs;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to improvements in hydraulic chairs. One of itsobjects is to pro vide an improved hydraulic raising and loweringmechanism to be employed on barber, dental, and surgical chairs and forsimilar purposes.

Another object is to provide a more simple, reliable, and inexpensivemechanism for the above purpose than has been heretofore in use.

It also consists in certain details of form, combination, andarrangement, all of which will be more fully set forth in thedescription of the accompanying drawings, in which Figure 1 is a sideelevation of the hydrau lic plunger. Fig. 2 is a side elevation of thehydraulic cylinder. Fig. 3 is a perspective view of the clamp forlocking the chair-tilting bar. Fig. 4 is a bottom plan view of thepump-piston. Fig. 5 is a perspective view of the bar for locking theplunger to its adjusted position in the cylinder. Fig. 6 is aperspective view of the crank-pin and cam at the inner end of theoperating-lever. Fig. 7 is a top plan view of the plunger and itsoperative parts. Fig. 8 is a section through the plunger and cylinder online .2 z of Fig. 7. Fig. 9 is a section through the same on line U Q)of Fig. 7. Fig. 10 is a bottom plan view of the plunger. Fig. 11 is aperspective view of the locking bar or wedge.

A represents the hydraulic plunger, which is secured to the under sideof the chair-seat and carries the operative parts.

B represents the hydraulic cylinder, which is mounted in the pedestal ofthe chair, as indicated in dotted lines in Fig. 2 and within which theplunger seats. The plunger consists of a hollow shell provided at itslower end with a head C, which is provided with a valve C, adapted topass a liquid say oil-- from the interior of the plunger down into thecylinder beneath the plunger and to normally prevent a return passage ofthe liquid.

D represents a spring to retain the valve in position. Within theplunger is located a pump-piston E, which is provided With a valve F,similar to the valve C and held in place by a spring F.

F. represents a set-screw securing the piston to the piston-rod G.

H represents a locking-bar which spans the plungerand seats in openingscut through the side walls of the plunger. The piston-rod G passesthrough an opening 11 in the bar [-1 and is connected by means of apitman'or link I witha crank-pin Jon the inner end of theoperating-IeverJ,so that the oscillation of the operating-lever throughthe arc K of its travel will reciprocate the pump-piston in the plungerand pump the liquid from the upper portion of the plunger above thepiston down through the valves of the piston and plunger into thecylinder beneath the plunger, and thereby elevate the chair-seat.Turning the handle of the operating-lever to the point L depresses thepiston and piston-rod, so that the stud M will contact with and open thevalve C, and at the same time the upper end of the passage N in thepiston-rodwill be depressed below the lower edge of the opening H in thelocking-bar H, which will permit the liquid in the cylinder to escapethrough the valve C and passage -N into the plunger above the pnmp-piston, and thereby lower the chair-seat, The upper end of thepassage N reciprocates within the passage II" during the act of pumpingand is sealed thereby. After the chair has been raised or lowered to thedesired pojusted position. The return vmovement of the operating-leverlifts the bar Q, releasing the plunger.

S represents a stud secured to the bar Q and seating in a slot S in thewall of the plunger, and T a spring for holding the upper end of the barQ in place and for preventing it from wedging the parts except whenpressed down by the cam P.

1 represents a bar passing through openings in the walls of the plungerand attached at one end to the mechanism ordinarily employed to tilt thechair-back and foot-rest.

2 represents a clamping-bar located in the upper end of the plunger andpivoted at 3.

4 represents a spring acting on the upper end of the bar 2 to normallyhold the bar 2 in position .to clamp and lock the bar 1.

The end of the crank-pin Jis provided with a cam-shaped face 5, whichwhen the operating-lever is in a vertical position, as shown in Figs. 8and 9, engages the earn 6 on the locking-bar 2 and lifts the bar torelease the bar 1 and permit the chair to be tilted.

I claim 1. In ahydraulic chair, acylinder; ahollow plunger provided witha valve at its lower end; a pump; a locking-bar spanning the plunger andseated in the side walls of the plunger; a bar located within theplunger with its lower end engaging and adapted to wedge the locking-barand plunger against the inner walls of the cylinder to lock the plungerin place; an operating-lever provided with a cam adapted to operate thewedge to lock and release the plunger.

2. In a hydraulic chair, a cylinder; a hollow plunger provided with avalve at its lower end; a locking-bar spanning the plunger and seated inopenings in the side walls thereof; a pump-piston provided with a valveand a stud projecting from its lower face; a piston-rod sliding throughan opening in the locking-bar; a passage leading from the lower end ofthe piston-rod to a point within the opening in the locking-bar; a barlocated within the plunger adapted to engage between the lockingbar andthe inner wall of the plunger to wedge the parts and lock the plunger inplace; an

operating-lever provided with a crank-pin for reciprocating the pump,and a cam adapted to throw the bar to lock the plunger.

3. In a hydraulic chair in combination with a cylinder a plunger; apump; and means for locking the plunger to the adjusted position in thecylinder; a tiltingbar; a spring-actuated clampingbar; and anoperating-lever provided with a cam-faced cran k-pin adapted to engagethe clamping-bar at one position of its stroke to release thetilting-bar, substantially as specified.

4:. In a hydraulic chair in combination with a cylinder; a hollowplunger; apump-piston and piston-rod; a locking-bar spanning the plungerwith one end projecting through the side wall thereof; a bar locatedwithin the plunger and actuated by the operating-lever at one point ofits stroke to engage between the locking-bar and the inner wall of theplunger to wedge the parts against the inner walls of the cylinder tolock the plunger to its adjusted position, substantially as specified.

5. In a hydraulic chair, a cylinder; a hollow plunger provided with avalve at its lower end; a pump-piston located within the plunger andprovided with a valve and a stud adapted to trip the valve in theplunger; a piston-rod provided with a passage leading from beneath thepiston to a point above the same, and means for normally closing theupper end of said passage; a locking-bar spanning the plunger with oneend projecting through the side wall of the plunger, said locking-barserving as a support for the upper end of the pistonrod; a bar adaptedto engage the locking-bar and plunger to wedge and look the plunger toits adjusted position; a tilting-bar; a springactuated clamping-baradapted to normally clamp the tilting-bar; and a common operatin g-leveradapted to operate the several mechanisms at different portions of itstravel, substantially as specified.

In testimony whereof I have affixed my signature in presence of twowitnesses.

FRANK KOENIGKRAMER. i/Vitncssesz F. W. REINERS, O. W. MILES.

